Electric bell



(No Model.)

J. F. WOLLENSAK.

ELECTRIC BELL.

Pa tented Jan. 27, 1891.

UNTTnn STATES PATENT Urrrcn.

JOHN F. IVOLLENSAK, OF CHICAGO, ILLINOIS.

ELECTRIC BELL.

$PECIFICATION forming part of Letters Patent No. 445,295, dated January 2'7, 1891.

Application filed September 29, 1890- Serial No. 366,502. (No model.)

T 0 all whom it may concern.-

Be it known that 1, JOHN F. WoLLENsAK,

,a citizen of the United States, residing at Chicago, Illinois, have invented certain new and useful Improvements in Electric Bells, of which the following is a specification.

The object of my improvement is to make the magnet-spools of electric bells adj ustabie so that. they can be moved toward orfrom the armature and fastened at any desired distance therefrom; and my invention consists in the features and details of construction hereinafter described and claimed.

In the drawings, Figure l representsa plan view of my improved electric bell with the top removed, so to show the parts; and Fig. 2 is an end View of a transverse section, taken in line 2 of Fig. 1, looking in the direction of the arrows.

In the old style of hell, provided with fixed magnet-spools, there has always been more or less dil'iiculty in getting the armature and hammer, which have usually been made in one piece, shaped to suit the position of the magnet-spools and the bell. As is well known, it is necessary when the hammer is drawn to the bell by the magnets that the armature should come in close contact with both of the magnet-cores, while the hammer must at the same time touch the bell. This requires three points of contact, and as the holes in which the parts are arranged as well the parts themselves vary more or less in size and shape, it is obvious that it is moreor less diflicult to arrange the armature and hammer to suit. This arrangement can only be done approximately before the parts are assembled into their working position. If they are not correct, they must be removed and bent into shape by hand, which operation is found necessary to be done several times before the correct shape and position of the parts can be obtained to secure the desired result.

In my improved bell I make the cores of the magnet-spools A long enough to extend through holes in the sideof the inclosing box or case and arrange the screws B in the case at right angles to the cores of the magnet-spools. By loosening the screws the magnet-spools may be moved in or out the requisite distance to secure the proper adjnstn'ient, and by tightening them the spools will be held in the de sired position. In this way the exact adj ustment of the three points-the two spools and the bell-may be elt'ected without having to take the pieces apart after they havebeen assembled, which enables me to effect saving and labor in the manufacture of the bell and make the parts so easy of adjustment that any one can arrange them in their proper positions.

\Vhile I have shown and described my im provement in connection with a bell in which two magnet spools are employed, yet it is equally applicable to those cases where only one is used. I desire, therefore, not to limit myself to the use of my adjustable magnet.- spool in connection only with those bells in which two are used.

What I regard as new, and desire to secure by Letters Patent, is

In an electric bell, the combination of a supporting-frame, an armature, and independently-adjustable magnet-spools movable toward or from the armature, substantially as described.

JOHN F. WOLLENSML Witnesses:

THOMAS A. BANNING, GEORGE S. Parson. 

